Dení Ramírez Macías (also known as Dení Ramírez) is a Mexican marine biologist ocean scientist, and conservationist, and director of Whale Shark México (Tiburon Ballena Mexico) since 2003. She leads the "Giants of Peru" project of the Save Our Seas Foundation.Ecology Project International lists Ramírez among "women scientists who are saving the planet", and "one of the few experts on whale shark genetics in the world"; she helped the Mexican government develop management plans for whale shark tourism and conservation.Ramírez helped form the nonprofit Hawai‘i Uncharted Research Collective, which she encouraged to collect whale shark sightings in the Hawaii region to help complete the picture of their lives.Ramírez founded Conexiones TerraMar which promotes science, conservation and education.